ISSUE-2236 (preserve-3d): Resolve Painter's Model with respect to 3d rendering, z-index [Module: Transforms]
http://www.w3.org/Graphics/SVG/WG/track/issues/2236
Raised by: Doug Schepers
On product: Module: Transforms
Per http://lists.w3.org/Archives/Public/public-svg-wg/2009JanMar/0148.html
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* There is an extremely important feature to 3d transforms that you
haven't discussed. In CSS Transforms we call it transform-style:
preserve-3d. Without this it is difficult to meet your requirements of
nested 3d transformations. On this point, I suggest you write up your
rendering model. As far as I can tell, this is the most important part
of applying 3d to SVG. What happens to the painters' model? Do things
closer in Z space draw in front, regardless of document order? What
about elements in adjacent siblings with different Z? Do you flatten
at group containers? Do objects intersect?
]]